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As a parent in Westminster, you quickly learn that babies and toddlers can go from playful to poorly in hours. Their immune systems are still developing, they cannot say what hurts, and small bodies lose fluids quickly. Knowing which symptoms are mild and which need prompt attention is a vital skill. Most childhood illnesses are short-lived and manageable at home. The key is recognising the signs that need a doctor.

Why young children need a closer look

Babies and toddlers are not small adults. Their airways are narrower, so a little swelling can cause significant breathing difficulty. They have less reserve for fluids and energy, meaning dehydration and exhaustion set in fast. They also rely on you to interpret their behaviour, because a toddler cannot say “my head hurts” or “it hurts to breathe”.

That is why subtle changes matter. A child who is snuffly but still drinking, playing, and sleeping normally is usually fine to monitor. A child who is quiet, floppy, or breathing differently needs a second look.

Fever: when it is a warning sign

A fever is a temperature of 38°C or higher. It is the body’s natural response to infection, and many fevers are harmless. What matters more than the number is how your child is behaving. A child with a temperature of 38.5°C who is drinking and responsive is often less concerning than a child with a lower temperature who is listless.

• In babies under three months, any fever of 38°C or above needs urgent assessment.
• For babies aged three to six months, a temperature of 39°C or above should be checked promptly.
• Use a digital thermometer under the arm or in the ear.
• Seek emergency help if a fever comes with a rash that does not fade under a glass, a stiff neck, or a high-pitched cry.

Poor feeding and changes in nappies

Refusing feeds or eating very little is an early sign of illness. For infants, watch wet nappies. A baby who normally has six or more wet nappies a day but suddenly has fewer than four is at risk of dehydration. Other signs include a dry mouth, no tears when crying, and sunken eyes.

Offer small amounts of fluid often. Continue breastfeeding or formula for babies. For toddlers, offer water, milk, or an oral rehydration solution. Do not worry about solid food for a day or two, but fluids are essential. If your child cannot keep anything down, or vomits green fluid, contact a doctor urgently.

Unusual sleepiness or irritability

All children have tired days, but unusual sleepiness is different. A child who is difficult to wake, floppy, or unresponsive needs immediate medical attention. Equally, a child who is inconsolable, crying in a way that sounds different, or arching their back and screaming may be in significant pain.

Trust your instincts. If your child is not themselves and you cannot explain why, that is a valid reason to seek advice. A private GP in Westminster can often see a child the same day, which can save a stressful trip to A&E for a non-emergency concern.

Breathing changes and other red flags

Breathing problems are among the most serious signs of illness. Look for:

• Fast breathing, even at rest.
• Nostrils flaring with each breath.
• Drawing in of the ribs or the dip above the collarbone.
• Grunting or noisy, whistling breathing.
• Pauses in breathing, or lips turning blue or grey.

If you see any of these, call 999 or go to your nearest emergency department. Do not wait for a GP appointment. Other red flags include a stiff neck, a rash that does not fade, a seizure, or a baby who is limp and unresponsive.

When to see a GP or seek urgent help

For non-emergency concerns, a private GP can offer a calm, unhurried assessment, often with same-day appointments. This is helpful if you are unsure whether a symptom warrants hospital, or if you want continuity of care for your family. In Westminster, many private practices also offer home visits for very young babies.

Call 999 or go to A&E if your child:

• Is struggling to breathe or has stopped breathing.
• Is unresponsive, floppy, or difficult to wake.
• Has a rash that does not fade under pressure.
• Has a seizure or a stiff neck.
• Is under three months old with a fever of 38°C or above.

For everything else, if you are worried, it is always better to check. You know your child best. A quick conversation with a GP can reassure you or catch something early. Most children recover quickly with rest, fluids, and cuddles — but knowing when to ask for help keeps them safe.